If you're ever in the Altoona area,
I highly recommend going to the Gallitzin Tunnels. They're relatively
easy to find, and are well worth the effort. There are plenty of
trains every day, and a caboose gift shop right beside, as well as a hobby
shop and a model railroad display. For the photographer, Gallitzin
may be better than Horseshoe Curve, because there is a roadway bridge just
after the tunnels, providing an excellent place for train watching and
photographing.

Here we see both of the Gallitzin Tunnels.

Something's approaching, but what?

Two Conrail helpers exit the tunnel.

Three locomotives pull a very long intermodal train towards
the tunnel.

Three(+) locomotives pull another long mixed train out of the tunnel.

Part of an intermodal train going through the tunnel.
The tunnel now in

use was widened and the height clearance increased to
accommodate double